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I can't see (or approve) the attachment, but it sounds to me like you need to kill your margins and padding.

If you don't have any major form elements on your page (or know what you're really doing when it comes to forms and CSS and are also willing to sacrifice some functionality) try using the universal selector at the very top of your page.

Code CSS:

*{margin:0;padding:0;}

Please let me knowj if that works for you. (Also understand I'm updating a clean installation of Windows, so I can't help you as far as browsers go right now.)

Since you've got so much HTML code, I'm going to have to see a live link to your page to be able to best advice you how to handle the CSS (even if it means a complete re-write, which I think it will entail; fortunately I can do that for you while showing you how and why the code I use works the way it does so you can learn from it and use the documentation and code as a basis for future work).